The original book has been in public domain in the United States since 1956. Baum's thirteen sequels entered public domain in the United States in 1986. The rights to these books were held by the Walt Disney Company, and their impending expiration was a prime motivator for the production of the 1985 film Return to Oz, based on Baum's second and third Oz books.Strange.
Oh! And remember when I mentioned that version of "Que Sera Sera" in an ad recently? Jennifer Terran would be the person singing it. That Beyoncé AmEx ad with the music I still have yet to ID (but it sounds like the sort've thing David Byrne would listen to)? Right here. The Kabuki theater kuroko stage-hand ad for that flatscreen TV? Ad No.1 Ad No.2.